Electric fuses and fuse holders therefor



Aug. 3, 1965 H. l. STANBACK 3,198,913

ELECTRIC FUSES AND FUSE HOLDERS THEREFOR Filed March 13, 1961 3Sheets-Sheet l INVENTOR. jawrzgsfjwac/ "aw aw Aug. 3, 1965 H. I.STANBACK 3,198,913

ELECTRIC FUSES AND FUSE HOLDERS THEREFOR Filed March 13, 1961 3Sheets-Sheet 2 J24 1Z4 INVENZ'OR. Y

$4755 mWwIfiQ/wm/Q BY FIE. 1E k Aug. 1965 H. l. STANBACK 3,198,913

ELECTRIC FUSES AND FUSE HOLDERS THEREFOR Filed March 13, 1961 3Sheets-Sheet 3 IN VEN TOR.

United States Patent 0 3,198, 13 FLEECE-EEC A l) FUSE HOLDERtl THEEEFGRHarris l. Stanhacir, Lexington, K assignor to Signer-e D Company, Ridge,lih, a corporation of Michigan Filed Mar. 13, lid-6i, der. No. 95,180 2Claims. (iii. Zdd-llf) This invention relates to electric cartridge-typefuses and fuse holders theref More particularly, it relates to fuses ofspecial construction adapted to cooperate with fuse holders of specialconstruction. The specially constructed fuses of this invention willalso cooperate with or fit standard fuse holders, but the speciallyconstructed fuse holders of this invention will not accommodate standardfuses, unless installed specifically to do so in a manner to bedescribed.

The invention is particularly useful when it is desired to connect aload to a power source having a higher short circuit capacity availablethan can safely be connected to a standard fuse. in such instances itwould be desirable from the standpoint of safety to provide means forpreventing installation of a standard fuse, and to accomplish thispurpose a fuse holder having one of the special constructions of myinvention may be used, and a fuse having a higher current interruptingcapacity than a standard fuse and adapted to cooperate with the specialfuse holder may be placed therein, the special fuse holder notaccommodating a standard fuse with a too low current interruptingcapacity.

The specially constructed fuses of my invention will also fit standardfuse holders and may be used in place of standard fuses in existinginstallations having standard fuse holders when a change in power supplyhas made higher short circuit capacity available than can safely beconnected to a standard fuse. Thus a knowledgeable user may save theexpense of replacing the standard fuse holders. Further, because thespecially constructed fuses of my invention can be used in standard fuseholders, it is not necessary to manufacture and stock two kinds of fuseswith high current interrupting capacity, one kind for new installationshaving specially constructed fuse holders which will not accommodatestandard fuses, and another kind to replace standard fuses in existinginstallations having standard fuse holders when a change in power supplyhas made higher short circuit capacity available than can safely beconnected to a standard fuse.

The various specially constructed fuse holders of my' invention are alladapted to be modified in such a manner that they may be selectivelyinstalled to accommodate both standard fuses and the speciallyconstructed fuses of my invention, or to accommodate only the speciallyconstructed fuses of my invention. Thus it is not necessary tomanufacture and stock two different kinds of fusible electrical devices,one with standard fuse holders and the other with soecially constructedfuse holders.

While the invention has been described as particularly useful to preventinstallation of standard fuses when safety demands a fuse having highcircuit interrupting capacity, it will be obvious that the invention isequally applicable to insure installation of fuses of proper ampererating, or proper current limiting characteristics, etc., and to preventinstallation of fuses which may be considered improper for any reason.

Accordingly it is an object of the invention to provide a novelconstruction for fuses with special characteristics and for fuse holdersadapted to cooperate therewith, wherein the novelly constructed fuseswill also fit in standard fuse holders but the novelly constructed fuseholders will not accommodate standard fuses.

A further object of the invention is to provide a novel fuse holderwhich can be selectively installed in one "ice manner to accommodateonly novelly constructed fuses particularly adapted to cooperatetherewith and in another manner to accommodate said novelly constructedfuses as well as standard fuses.

Another object of the invention is to provide novel construction offuses and fuse holders having all the advantages hereinbefore set forth.

Other objects and advantages of the invention will hereinafter appear.

in the drawings:

FIGURE 1 is a side elevational view of a standard ferrule-type fuseholder holding a standard ferrule-type cartridge fuse;

lGURE 2 is a side elevational View, partly in section, of a specialferrule-type fuse holder constructed in accordance with the inventionand holding a special ferruletype cartridge fuse constructed inaccordance with the invention;

FlGURE 3 is a cross-sectional view taken along section line of FIGURE 2;

FIGURE 4- is a side elevational view of a modified form of the speciallyconstructed fuse holder of FIG- URE 2;

FlGURE 5 is a side elevational view of a standard knife-blade type fuseholder holding a standard knifeblade type cartridge fuse;

l lGURE 6 is a side elevational view of a special knifeblade type fuseholder constructed in accordance with the invention and holding aspecial knife-blade type cartridge fuse constructed in accordance withthe invention;

7 is a cross sectional View taken along section line 7 of FIGURE 6;

FIGURE 8 is a fragmentary side elevational view showing a modified formof the specially constructed fuse of FEGURE 6;

FIGURE 9 is a side elevational view of another standard knife-blade typefuse holder holding a standard knifeblade type cartridge fuse;

FEGURE 10 is a side elevational view of a modified form of specialknife-blade type fuse holder constructed in accordance with theinvention and holding a special knife-blade type cartridge fuseconstructed in accordance with the invention;

PlGURE 11 is a cross sectional view taken along section line l111 ofFIGURE 10;

FIGURE 12 is an end elevational view of a clamping member of one of thefuse clips of the standard knifeblade type fuse holder of FEGURE 5;

FIGURE 13 is a plan view of a portion of a mounting panel showingmounted thereon a standard ferrule-type fuse holder holding a standardferrule type cartridge fuse and a special ferrule type fuse holderconstructed in accordance with the invention and holding a specialferrule type cartridge fuse constructed in accordance with theinvention; and

FIGURE 14 is a plan view of a portion of a mounting panel showingmounted thereon a standard knifeblade type fuse holder holding astandard knife-blade type cartridge fuse and a special knife-blade typefuse holder constructed in accordance with the invention and holding aspecial knife-blade type cartridge fuse constructed in accordance withthe invention.

FIGURE 1 shows a standard fuse holder 19 holding a standard ferrule typecartridge fuse 15 comprising a hollow cylindrical insulating barrel 16and electrically conductive hollow cylindrical ferrules 17 and 18 closedat their outer ends. it will be understood that the fuse 15 contains afusible element (not shown) extending betw en the ferrules 17 and 18within the barrel 16, and that all the other fuses shown and describedherein contain fusible elements. The fuse holder 19 comprises a pair ofidentical electrically conductive fuse clips 26 and 21 mounted inspaced-apart relationship on an insulating base member 22 which, forexample, could be a separate member or part of a panelboard. The fuseclip 2t comprises a clamping member 23 having a pair of resilient curvedarms 24 for engaging the ferrule of a cartridge fuse such as fuse andthe arms are provided with a loading spring member 25 which serves tourge them together and to limit axial movement of the fuse. The clampingmember 23 is provided with a threaded mounting hole 26 which registerswith a mounting hole 27 in an electrically conductive terminal plate 28having a wire connecting screw terminal 29 thereon. A mounting screw 30extends through a mounting hole 31 in the base member 22 and through themounting hole 27 in the terminal plate 23 and screws into the threadedmounting hole 26 in the clamping member 23 to secure the fuse clip 20'and the terminal plate 28 to each other and both to the base member 22.

The fuse clip 21 comprises a clamping member 32 having arms 33 and aloading spring member 34 and the clamping member is provided with athreaded mounting hole 35 which registers with a mounting hole 35 in aterminal plate 37 having a screw terminal 33 thereon. A screw 39 securesthe fuse clip 21 and the terminal plate 37 to the base member 22. Thearms 24 of the clamping member 23 and the arms 33 of the clamping member32 are of the same shape as arms 62 of a clamping member 61 of FIGURE 3,to be hereinafter described.

FIGURE 2 shows a special ferrule-type cartridge fuse 40 constructed inaccordance with the invention and mounted on a special fuse holder 41constructed in accordance with the invention. The term special used inconnection with a fuse or fuse holder means specially constructed inaccordance with the invention. The special fuse 49 may for examplecomprise an insulating barrel 42 which is shorter than the barrel 16 ofthe standard fuse 15 shown in FIGURE 1 and is provided with electricallyconductive ferrules 43 and 44 and with an additional ferrule 45 which isreversely disposed endto-end to the ferrule 44 and is electrically andmechanically attached thereto as by welding or soldering as at 46. Theferrule 45 forms a registry means or cylindrical extension on the end ofthe fuse 4t and is open at or has an opening in its outer end. Theferrules 44 and 45 could also be formed as a single tube with a barrierbetween the ends thereof. Other equivalent ways of constructing one endof the special fuse 40 will be apparent to those skilled in the art.

The special fuse holder 41 comprises a pair of fuse clips 47 and 48mounted on an insulating base member 49. The fuse clip 47 in FIGURE 2 isidentical to the fuse clip 20 shown in FIGURE 1, and comprises aclamping member 50 having arms 51 and a loading spring member 52. Theclamping member 50 is provided with a threaded mounting hole 53 whichregisters with a hole 54 in a terminal plate 55 having a screw terminal56 thereon. A screw 57 secures the clamping member 50 and the terminalplate 55 to the base member 49. The fuse clip 48 shown in FIGS. 2 and 3is like the fuse clip 21 shown in FIG. 1 in that it comprises a terminalplate 58, a screw terminal 59, a mounting screw 60, and a clampingmember 61 having arms 62, but it differs therefrom in that a springmember 63 thereof is reversely dsposed and enlarged so as not tointerfere with the insertion of the ferrule of a fuse, and the terminalplate 58 is longer. If preferred, the spring member 63 could be omitted.It is to be noted that the clamping members 50 and 61 of the specialfuse holder 41 in FIG. 2 are closer together than the clamping members23 and 32 of the fuse holder 19 in FIG. 1. In addition to the foregoingcomponents, the fuse clip 48 includes an interference means which takesthe form of a U-shaped rejection bracket 65 having a lower leg 66provided with a threaded hole d7 which accommodates the mounting screwdtl which secures the bracket 65, the clamping member 61, and theterminal plate 53 to the base member 49. An upper leg or portion 68 ofthe interference means terminates adjacent the outer endof the clampingmember 61 of the fuse clip 43 and is adapted to be accommodated by thecylindrical extension 45 on the special fuse 4h. The portion 68 isoutside of the clamping member 61, or not within the space immediatelybetween the arms 62.

From the foregoing description of FIGS. 1, 2, and 3 it is apparent thatwhile the standard fuse 15 shown in FIG. 1 can be accommodated by thestandard fuse holder 19 shown in FIG. 1, it cannot be accommodated bythe special fuse holder 41 shown in FIG. 2 because the clamping members5419 and 61 of of the fuse clips 47 and 43, respectivcly, of the latterare too close together and the portion 68 of the rejection bracket 65interferes with insertion of the fuse into the clamping member 61. It isfurther apparent that the special fuse 40 shown in FTGS. 2 and 3,

which has substantially the same overall length as the standard fuse 15,can be accommodated by the special fuse holder 41 shown in FIG. 2 and bythe standard fuse holder 19 shown in FIG. 1 since the ferrule 45 on thespecial fuse 40 would be accommodated by the clamping member 32 of thefuse clip 21 of the standard fuse holder 19.

FIG. 4 shows a special form of fuse holder 79 fabricated in two separatesections 71 and 72 which can be selectively disposed on a mounting panel73 in either of two positions relative to each other so as, first, toaccommodate the standard fuse 15 shown in FIG. 1 or the special fuse 4-0shown in FIG. 2, or second, to accommodate only the special fuse lll.The section 71 of the fuse holder 7% comprises an insulating base block74 and a fuse clip 75 identical to the clips 29 and 47 shown in FTGS. land 2, respectively. The insulating base block 74 is provided with amounting hole 76 for accommodating a mounting screw 77 receivable in athreaded mounting hole 78 in the mounting panel 73. The section 72 ofthe fuse holder comprises an insulating base block 79 and a fuse clip8%) identical to the fuse clip 48 shown in FIGS. 2 and 3. The insulatingbase block 79 is provided with a mounting hole 81 for accommodating amounting screw 32 receivable in either of two spaced-apart threadedmounting holes 83 and 84 in the mounting panel 73. If the mounting hole83 in the mounting panel 73 is employed, as shown in FIG. 4, theclamping members of the fuse clips and St) are spaced apart the samedistance as the corresponding clamping members 23 and 32 of FIG. 1 andeither the standard fuse 15 shown in FIG. 1 or the special fuse 40 shownin FIGS. 2 and 3 may be inserted. However, if the mounting hole 84 inthe mounting panel 73 is employed, it will be understood that theclamping members of the fuse clips 75 and 8%) will be spaced apart thesame distance as the corresponding clamping mem bers 50 and 61 of FIG. 2and only the special fuse 49 shown in FIGS. 2 and 3 may be inserted. Themounting screw 82 may then be a one-way screw, or it may be insertedfrom the back of the mounting panel 73, if utmost safety is desired.

It is to be understood that the selective arrangement disclosed inconnection with F G. 4 wherein ferrule type cartridge fuses and fuseholders therefor are employed can also be applied to the knife-bladetype cartridge fuses and fuse holders therefor which ahe hereinafterdescribed.

FIGS. 5, 6, 7, 8, and 12 illustrate another embodiment of the presentinvention. FIG. 5 shows a standard knifeblade type cartridge fusecomprising an insulating barrel 116 and electrically conductiveknife-blade terminals 117 and 118 mounted on a standard fuse holder 119.The fuse holder 119 comprises a pair of identical electrically fuseclips 12f) and 121 mounted in spaced-apart relationship on an insulatingbase member 122. The fuse clip 12% comprises an electrically conductiveclamping member 123 having a pair of resilient straight arms 124, bestseen in FIGURE 12, for engaging the knife-blade terminal of a cartridgefuse such as fuse 115. The clamping member 123 is provided with amounting hole 125 which registers with a threaded mounting hole 126 inan electrically conductive terminal plate 127 having a screw terminal128 thereon. A mounting screw 129 extends through a mounting hole 136 inthe base member 122 and through the mounting hole 125 in the clampingmember 123 and screws into the threaded mounting hole 126 in theterminal plate 127 to secure the fuse clip 12% to the base member. Thefuse clip 121 is identical to fuse clip 12% and will not be separatelydescribed.

FIGURE 6 shows a special knife-blade type cartridge fuse 132 constructedin accordance with the invention and mounted on a special fuse holder133 constructed in accordance with the invention. The special fuse 132is identical in size and shape to the standard fuse 115 shown in FIGURE5 except that the knife-blade terminal 134 thereof is provided withregistry means in the form of a curved notch or cutout 135. Ifpreferred, the special fuse 132 could be provided with a straight notch136 as shown in FIGURE 8.

The special fuse holder 133 shown in FIGURE 6 is identical in allrespects to the standard fuse holder 119 shown in FIGURE 5 except thatthe clamping member 137 of its fuse clip 138 is provided with aninterference means which takes the form of a rivet or rejection pin 139,best seen in FIGURE 7, which extends through a pair of holes 1% and 141in arms M2 and 1 33 thereof, respectively, and is adapted to accommodatethe cutout 135 in the terminal 134 of the special fuse 132. Ifpreferred, the holes 1 1i and 1 11 in the arms 142 and 143 could bethreaded and instead of the pin 139, a bolt (not shown) could beemployed.

From the foregoing description of FIGURES 5, 6, 7, 8, and 12 it isapparent that while the standard fuse 115 shown in FIGURE 5 can beaccommodated by the standard fuse holder 11? shown in FIGURE 5, itcannot be accommodated by the special fuse holder 133 shown in FIG- URE6 because the rejection pin 139 will interfere with insertion of theknife-blade terminal 118 into the clamping member 137. It is furtherapparent that the special fuse 132 shown in FIGURE 6, or that shown inFIGURE 8, can be accommodated by the standard fuse holder 119 of FIGURE5, and it can also be accommodated by the special fuse holder 133 shownin FIGURE 6 merely by engaging the pin 139 in the notch 135 (or 136) inthe knife-blade terminal 134 and pivoting the fuse into engagement withthe clamping member of the other fuse clip 144 of the fuse holder 1133.

FIGURES 9, l0, and 11 depict another embodiment of the presentinvention. FIGURE 9 shows a standard knifeblade type cartridge fusewhich may be identical to the standard fuse 115 of FIGURE 5, mounted ona standard fuse holder 151. The fuse holder 151 comprises a pair ofidentical electrically conductive fuse clips 152 and 153 mounted inspaced-apart relationship on an insulating base member 154. The fuseclip 152 comprises an electrically conductive clamping member 155 havinga pair of bent-over resilient arms 156 for engaging the knife-bladeterminal of a cartridge fuse such as fuse 15f therebetween. The arms 156are shaped identically to arms 167 and 163 of a clamping member 166 ofFIGURE 11, to be hereinafter described. The clamping member 155 isprovided with a mounting hole (not shown) which registers with amounting hole (not shown) in a C-shaped loading spring (not shown) whichgrips the bent-over resilient arms 156 to insure that the latter gripthe knifeblade terminal of a fuse properly. The loading spring may beidentical to a loading spring 169 of FIGURE 11, to be hereinafterdescribed. The mounting hole in the loading spring also registers with athreaded mounting hole (not shown) in an electrically conductiveterminal late 157 having a screw terminal 158 thereon. A mounting screw159 extends through a mounting hole (not shown) in the base member 154,through the mounting hole in the clamping member 155, through themounting hole in the C-shaped loading spring, and screws into thethreaded mounting hole in the terminal plate 157 to secure the fuse clip152 to the base member 154. The fuse clip 153 is identical to fuse clip152 and will not be separately described.

FIGURE 10 shows a special knife-blade type cartridge fuse 16fconstructed in accordance with the invention and mounted on a specialfuse holder 161. The special fuse 161i is identical in size and shape tothe standard fuse 156 shown in FIGURE 9 except that the knife-bladeterminal 162. thereof is shorter than the corresponding one on thestandard fuse 150.

The special fuse holder 161 comprises a pair of electrically conductivefuse clips 163 and 164 mounted in spaced-apart relationship on aninsulating base member 165. The fuse clip 164 comprises an electricallyconductive clamping member 166 having a pair of bent-over resilient arms167 and 168 for engaging the knife-blade terminal of a cartridge fusesuch as fuse 169 therebetween. The clamping member 166 is provided witha mounting hole (not shown) which registers with a mounting hole (notshown) in a C-shaped loading spring 169 which grips the bent-over endsof the resilient arms 167 and to insure that a knife-blade terminal willbe gripped properly. The mounting hole in the loading spring 169 alsoregisters with a threaded mounting hole (not shown) in an electricallyconductive terminal plate 170 having a screw terminal 171 thereon. Amounting screw 172 extends through a mounting hole (not shown) in thebase member 165, through the mounting hole in the clamping member 166,through the mounting hole in the loading spring 169, and screws into thethreaded mounting hole in the terminal plate 17d to secure the fuse clip164 to the base member 165.

The fuse clip 1.63 is identical with the fuse clip 164 as thus fardescribed, and will not be separately described. The fuse clip 164 isadditionally provided with an L-shaped interference member 173 havingits short leg 1'74 secured to the bent-over arm 167 by a screw 175 andits long leg 176 depending between the arms 167 and 168 adjacent theouter end of the clamping member 165. The screw 175 may be a one-wayscrew, or it may be otherwise locked in position, if utmost safety isdesired.

From the foregoing description of FIGURES 9, 10, and 11 it is apparentthat while the standard fuse 155 shown in FIGURE 9 can be accommodatedby the standard fuse holder 151 shown in FIGURE 9, it cannot beaccommodated by the special fuse holder 161 shown in FIGURE 10 becausethe interference member 173 interferes with the insertion of the knifehlade terminal of fuse 150 into the clamping member 166. It is furtherapparent that the special fuse 16f) shown in FIGURE 10 can beaccommodated by the special fuse holder 161 shown in FIGURE 10 becauseof the shorter length of its knife-blade terminal 162 which does notinterfere with the interference member 173 on the clamping member 166 ofthe fuse clip 164.

FIGURE 13 shows a portion of a mounting panel 130 having a standardferrule-type fuse holder and fuse 181 and a special ferrule-type fuseholder and fuse 182 mounted thereon. The standard fuse holder and fuse31 are like the fuse holder 16 and fuse 15 of FIGURE 1, and the specialfuse holder and fuse 182 are like the fuse holder 41 and fuse 49 ofFIGURE 2.

FIGURE 14 shows a portion of a mounting panel 183 having a standardknife-blade type fuse holder and fuse 184 and a special knife-blade typefuse holder and fuse 185 mounted thereon. The standard fuse holder andfuse 184 are like the fuse holder 1 19 and fuse 115 of FIGURE 5, or thelike the fuse holder 151 and fuse 150 of FIGURE 9. The special fuseholder and fuse 185 are like the fuse 7" holder 133 and fuse 132 ofFIGURE 6, or like the fuse holder 161 and fuse 160 of FIGURE 10.

By way of example, if a user of a mounting panel 130 has a supply offuses .15 and a supply of fuses 40 on hand, he cannot inadvertently orintentionally create an unsafe condition by placing a standard fuse 15in a special fuse holder 41 of the fuse holder and fuse 182.

Various modifications may be made in the structure disclosed withoutdeparting from the spirit and scope of the invention.

I claim:

1. The combination comprising a mounting panel, a first fuse clip, asecond fuse clip, interference means disposed adjacent said second fuseclip, a first ferrule type cartridge fuse of predetermined length, and asecond ferrule type cartridge fuse shorter than said predeterminedlength but having registry means on one end such that the total lengthof said second fuse and registry means taken together is substantiallyequal to said predetermined length, said fuse clips being mountable onsaid mounting panel selectively in two different relative positions withrespect to each other in both of which relative positions saidinterference means is disposed on the opposite side of said second fuseclip from said first fuse clip, said fuse clips being disposed a firstpredetermined distance apart in a first of said relative positions andbeing disposed a second predetermined distance apart in a second of saidrelative positions, said second predetermined distance being greaterthan said first predetermined distance, said registry means beingcooperable with said interference means and said second fuse beingmountable in said fuse clip for clamping engagement thereby when saidfuse clips are in said first relative position, said first fuseinterfering with said interference means and being unmountable in saidfuse clips when said fuse clips are in said first relative position,said first fuse clearing said interference means and being mountable insaid fuse clips for clamping engagement thereby when said fuse clips arein said second relative position, and said second fuse being mountablein said fuse clips with said registry means clampingly engaged by saidsecond fuse clip when said fuse clips are in said second relativeposition.

2. The combination comprising a mounting panel, a

first fuse clip mounted on said mounting panel, a second fuse clipmounted on said mounting panel, said fuse clips respectively beingconstructed and arranged to clampingly engage opposite end ferrules of aferrule type cartridge fuse, interference means adjacent said secondfuse clip on the opposite side thereof from said first fuse clip, saidinterference means including a projection having a fixed end portion anda free end portion, said free end portion of said projection beingdisposed closer than said fixed end portion to said second fuse clip,and a ferrule type cartridge fuse having first and second opposite endferrules respectively clampingly engaged by said first and second fuseclips, said second end ferrule having a generally cylindrical extensionthereon having an open outer end, and said free end portion of saidinterference means being received in said cylindrical extension on saidsecond end ferrule of said ferrule type cartridge fuse.

References Cited by the Examiner UNITED STATES PATENTS 502,541 8/93Thalacker 200-433 850,836 4/07 H-ornsby et a1 200119 1,067,568 7/ 1-3Young 2001l3 1,093,607 4/14 Davis 200--l33 1,122,575 12/14 Cook et al200133 1,227,753 5/17 Cole 200133 1,413,735 4/22 Hynes 200119 1,665,4464/28 Conrad 339253 1,953,343 4/34 Frank 200133 1,953,807 4/34 Jackson eta1 339259 1,981,929 11/34 Starrett 317-116 2,086,727 7/37 Morris 2001332,380,114 7/45 Kurillo 200--133 2,907,849 10/59 Kobryner 2001192,943,295 6/ 60 Stewart 339-258 FOREIGN PATENTS 153,023 1/56 Sweden.

ROBERT K. SCI-IAEFER, Acting Primary Examiner.

MAX L. LEVY, BERNARD A. GILHEANY,

Examiners.

2. THE COMBINATION COMPRISING A MOUNTING PANEL, A FIRST FUSE CLIPMOUNTED ON SAID MOUNTING PANEL, A SECOND FUSE CLIP MOUNTED ON SAIDMOUNTING PANEL, SAID FUSE CLIPS RESPECTIVELY BEING CONSTRUCTED ANDARRANGED TO CLAMPINGLY ENGAGE OPPOSITE END FERRULES OF A FERRULE TYPECARTRIDGE FUSE, INTERFERENCE MEANS ADJACENT SAID SECOND FUSE CLIP ON THEOPPOSITE SIDE THEREOF FROM SAID FIRST FUSE CLIP, SAID INTERFERENCE MEANSINCLUDING A PROJECTION HAVING A FIXED END PORTION AND A FREE ENDPORTION, SAID FREE END PORTION OF SAID PROJECTION BEING DISPOSED CLOSERTHAN SAID FIXED END PORTION TO SAID SECOND FUSE CLIP, AND A FERRULE TYPECAR-